How Coffee Aroma Relates to Skunk Stench

coffee aromaCuriously, the aroma chemicals in coffee closely resemble the stench-producing chemicals in the abominable skunk spray! They are similar, but they are not identical, and they do not occur in proportionate quantities.

Skunk Stench

The chemicals that primarily give skunk spray its stench are thiol derivatives—in particular, derivatives of the sulfur alcohol n-butyl mercaptan (CH₃-CH₂-CH₂-CH₂-SH).

The portion of this compound responsible for its smell is the -SH group, a sulfur atom bonded to a hydrogen atom, which is similar to the -OH or alcohol group. Common derivatives modify the carbon chain. Another variation chemically modifies the -SH group, using acetic acid (CH₃-COOH) to form the corresponding thioacetate.

coffee aroma

Two of the most odoriferous skunk spray mercaptans are (E)-2-buten-1-thiol and 3-methyl-butanethiol. Other than its prevalence (it makes up approximately 2/5 of skunk spray) a factor that could intensify its aroma is its double bond, which makes it an alkene mercaptan. The basic carbon chain is not CH₃-CH₂-CH₂-CH₂-, but CH₃-CH=CH-CH₂-. Similarly, the brown marmorated stinkbug produces two foul smelling compounds; both are aldehydes and alkenes.

Coffee Aroma

There are two mercaptans (thiols) especially responsible for coffee aroma—methyl mercaptan (CH₃-SH) and furfuryl mercaptan (C₄H₃O-CH₂-SH). Typically, the smaller a mercaptan molecule is, the more volatile it is, and the more intense its aroma is likely to be. However, these mercaptans are present in very small amounts in coffee. It takes a gas chromatograph to detect them!
coffee aroma

In Conclusion

So when is it that the presence of a skunk is likely to smell most like our delicious coffee aroma? It is long after the initial presence of our striped or spotted friend—when its mercaptan levels have diminished, causing its odor to have faded considerably.

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9 thoughts on “How Coffee Aroma Relates to Skunk Stench

  • Sandra Avila

    We have skunks in my neighbourhood. Many times I’ll wake up, thinking I smell coffee, then realize it’s actually skunk. Funny how something so good can almost smell like something so bad!

  • Sue Pagel

    I am a coffee-holic and love the aroma. I’ve wondered for a long time if the chemicals in coffee and skunk spray have similarities, because they smell similar to me sometimes. Oddly, faint skunk scent doesn’t offend me as much as it does most people… now I know why!

  • Martin Norred

    “Funny” anecdote, I had an old Dodge van for about 3-4 years, in the mornings it was fine, but after a 5 or 10 mile drive, there was a definite skunk smell! And the odor was still there when I gave it away. For a long time, I thought the smell was coming from under the house, but finally figured it out. Buuut…. I just wondered if possibly that might be the reason the Chevy dealer gave me such a good deal?!?!

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